I've never done a rebuild. I only do my normal routine maintenance. I recently got a new (new to me -it's a steel frame rebuild with Dura Ace components) road bike to replace my late 80's Trek 550. I'm thinking about picking up some used Shimano parts to replace the Suntour derailleur (6-speed cassette) and Dia-Compe brakes. i already replaced the chainring with a compact double. My questions -
1. Should I do it? It would mainly be for fun(?). I don't really need another bike.
2. If I replace the cassette can I fit a 9-speed on there?
3. How big a hassle would it be to replace downtube shifters with brake lever shifters?
4. What else should I consider?